Grinding machine



June '8, 1937. c. BOOTH GRINDINQ-MACHINE Original Filed llay 20, 1927 3 Sheets-Sheet 1 INVENTOR; CZ 5/15/1/7 5007 ATTORNEYS,

June 8, 1937.. Q BOOTH v 2,083,115

I GRINDING MAcHmE Original Filed May 20, 1927 3 Sheets-Sheet 2 ATTORNEYS June 8 1937. c. BOOTH GRINDING MACHINE Origin g1 Filed May 20, 1927 3 Sheets-Sheet 3 INVENTOR, C1 f/Vf/VT 5007 3% QZZQZZM ATTORNEY.

Patented June 8, 1937 UNITED STATES PATENT OFFICE 2,083,115 GRINDING mounts Clement Booth, Cincinnati, Ohio, assignor to cmcinnati Grinders Incorporated, a corporation of Ohio -0riginai application May 20, 1927, Serial No.

Divided and this application December 24, 1934, Serial N0. 759,08?

8 Claims. (01. 125-41) This invention relates to centerless grinding machines and more particularly to thetrulng of the wheels thereof.

Thisapplication is a division ofmy application Serial No. 192,878, filed May 20, 1927, entitled Grinding machine, patented December 25, 1934, as Patent No. 1,985,237.

One of the objects of this invention is to provide a simple, practical and eflicient apparatus for truing the wheels of a centerless grinding machine. Anotherbbject is to provide an apparatus of the above-mentioned nature capable of wide range of use and of accurate action and operation. Another object is to provide a grinding machine of the above-mentioned nature which is and arrangements of parts as will be exemplified convenient to operate and to true the wheels quickly and accurately to meet the conditions of practical use. Other objects willbe in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements,

in the structure to be. hereinafter described and the scope o1v the application of which will be indicated in the following claims.

In' the accompanying drawings in which is shown one of the various possible embodiments of this invention, l

Figure 1 is a vertical' longitudinal sectional view of the grinding machine, certain parts being omitted;

Figure 2 is a top plan view with certain parts broken away;

s, Figure 3 is a front elevation on a larger scale,

as it would be seen from the front in Figure 2,

of a portion of the machine showing the mechanism for use in connection with truing the wheels,

and v Figure 4 is a vertical sectional view as seen along the lined-4 of Figure 3, and

Figure 5 is'a fragmentary diagrammatic top plan view on a reduced scaleshowing the relationship of one of the grinding wheels, the truings.

ing wheel therefor, and the gauge bar.

Similar reference characters refer to similar parts throughout the several views of the draw- For complete details of the-grinding machine per se, reference is made to my above-mentioned patent.

Referring now to Figures land 2, the grinding machine comprises generally a frame It, slidably supporting a pair .of carriages II and I2, which rotatably mount a grinding wheel I6 and a regulating wheel 20, these wheels having disposed therebetween a work support 2l,.adapted to support a work piece I (Figure 3). Carriages II and I! (Figure 1) are manually movable toward and away from one another by means of hand wheels 36 and 22 respectively, there being also provided a hydraulic mechanism generally indicated at 25 for reciprocating carriage H and regulating wheel 20. Thus wheels i8 and 20, and work support 21, comprise a work receiving throat the size of which is readily variable by movement of the carriages to receive work of different diameters.

, Wheels l6 and (Figure 3) preferably rotate in the same direction so that the portions thereof contacting opposite sidesof work piece 24! move in opposite directions as indicated by the arrows in Figure 1. Regulating wheel 20 rotates I at a much slower speed than grinding wheel l8,

and its axis is inclined with respect to the axis of work piece-2H and wheel i6 so that a feeding component is exerted upon the work piece to effect feeding thereof along worksupport 2| and 'across the abrasive periphery of grinding wheel It, thus to feed the work piece through the abovenoted throat, all as is described in detail in my above-noted patent.

Carriages ii and i2 mount respectively truing tools 2" and 2" which are automatically reciprocable in hydraulic cylinders M9 and 220 respectively, suitable valve and pipe connections "I and 223 being provided respectively for each of the cylinders. Truing tools 218 and 2H are re,-

and the work. For example, when the axis of the regulating wheel is inclined, as pointed out above with respect to the path of movement of the work, thechief function of the truing is to dress the wheels surfaces so that they present to each other properly related lines along which thework is to contact with the wheels. Particularly in centerless grinding machines, it is advantageous in many cases to grind above centers and in other cases to grind below .centers and I have illustratively shown in Figure 1a grinding machine setup to grind above centers.

In a machine in. which the wheels are arranged as shown in Figure 1 of the drawings, best re- 5 grinding wheels and work are so arranged, it is quite important that the truing tool engage the wheel it is dressing along a line in the plane of the lines of contact between the wheels and the work. The importance of this feature lies in the fact that, particularly with respect to the regulating wheel whose axis as noted above is inclined. dressing of the regulating wheel by the truing wheel results in a slight concavity in the peripheral surface of the wheel. If the line of contact between the truing tool and the regulating wheel is either above or below the proper plane of engagement, then the degree of concavity in the regulating wheel will vary from the proper value and the wheel can not properly engage the work piece to grind it accurately.

For example, with reference to Figure 3, the peripheral surface of regulating wheel 20, if dressed by passing truing tool 2l8 thereove'r along line 225, would be materially different from the surface resulting from passing the truing toolthereover along line 226. The configuration of the former surface would be incorrect and could not accurately grind work piece 2.

Still referring to Figure 3, truing tool 2l2 is shown mounted to operate ,upon the surface of regulating wheel 20 on the side thereof opposite to work piece 2. This is of substantial advantage over passing the truing tool between the wheels, since it is not necessary to interfere with the setting of the work support or other adjustments in order to true the wheels. The truing tool 216 is mounted in a bracke 221 which is carried by and is vertically adjustable in the slide 2I8 and which may be locked in the position to which it is adjusted by means of a set screw 222. Secured to the guard 22! about the wheels is a bracket 220 having an outwardly projecting arm 22l (see also Figure 4) which provides at its outer end an elongated This rod 223 is squared except for the portion 222' thereof which is supported in the bearing 222. A set screw 23! is provided for fixing the position of the rod 232 in its bearing. Slidably 222 having a depending portion 222 in which is slidably supported a pin 221 (see also Figure 4 The left-hand end of the rod 222' extends in front.

the guard 228. Preferably, its under-surface is grooved and mates with a guiding projection 222 on the guard, and it may be locked in the vertical position to which it is adjusted by means of a clamping bolt 229 passing through a vertical slot 24!) therein. The use of this construction is as follows: A work piece such as 2 of the size to be ground is placed in the grinding throat and in engagement with the wheel surfaces. The point 221 is then slid inwardly (see Figure 4), the bracket 226 is -slid' along the squared rod 222 and the bracket 220 is adjusted vertically until the point 221 (Figure 4) of the pointer coincides with the point 222 (Figure 3) which marks the line of contact between the regulating wheel and the work. The rod 222 is parallel to the center line 225. The vertical dis- 75 tance between the center of the pointer 221 and bearing 222 in which issupported a rod 222..

mounted upon the squared rod 222 is a bracket the rod 233, for example, the lower edge of the rod, is a fixed distance. The truing tool supporting bracket 221 is now adjusted vertically in the slide 2i8, by loosening the set screw 228, until the vertical distance between the truinz point and the lower edge of the bar or rod 233 is exactly equal to the fixed distance between the center of the pointer 231 and the lower edge of the rod. This fixed distance is indicated by appropriate markings upon the surface of the bracket 221 in ordento facilitate this adjustment. In this manner, the proper vertical adjustment of the truing tool is made with the greatest convenience.

Accordingly, when the truing tool H6 is subsequently traversed across the face of the regulating wheel 20, by the hydraulically-actuated mechanism 2l82l9 (Figures 1 and 2)., the latter causing the truing tool 2|6 to move in a straight line parallel to the axis of the work piece 2 (Figure 3), the tilted regulating wheel 29 has its operative peripheral surface thereby slightly concaved to present at 223 (Figure 3) astraight line across its surface with which the work piece 2 contacts or in which the regulating wheel 20 and work piece 24! are tangent as the regulating wheel, and slowly rotating in the direction of' the arrow, rotates the work piece 2 as the grinding wheel I6, juxtaposed to the regulating wheel, grinds the work piece. As the tilted regulating wheel feeds the work in an axial direction along the work support 2i (in a direction toward the member 129 in Figure 2),- therefore, a true straight line contact between regulating wheel and work piece is maintained during this movement, it being understood that the line of contact of the work piece 2 (Figure 3) with the work support 2| and the line of contact between the work piece 2 and the grinding wheel 16 are parallel to each other /and parallel to the line of traversing movement of the truing tool 216 as the path of movement of the latter is determined by its supporting and moving mechanism 2l2-2|2 (Figures 1 and 2).

Should a different diameter of work have to be ground, so that this line of contact of the regulating wheel with the work is lower or higher than that illustratively above assumed or is lower or higher than the center line 225 (Figure 3), the above-outlined procedure is again gone through. The differently diamete'red work piece is put in place between the two wheels, the bracket 220 (Figures 3 and 4) is correspondingly readjusted so that the pointed end 221 of the index pointer or pin 221 is at a height to correspond to the new line of tangency, whereupon the truing tool bracket or support 221 (Figure 3) is shifted vertically relative to its slide 2" to correspond and hence to bring its point to the same distance below the rod or base 222 as is the spacing from the latter of the index point or pin 221*.

It will be noted that, referring to Figure 3, and as already noted above, the bar 222 is of sufiicient length to extend beyond the left-hand end or side of the regulating wheel 20 and virtually to extend across the path of movement of the bracket 221 itself, assuming that the latter is capable of movement toward the observer viewing Figure 3 beyond the outermost edge of the wheel 20. Because of this extension of the rod 222, the above-mentioned markings or graduations 200 (Figure 3) on the surface of the bracket 221 may, if desired, be used to set the vertical position of the bracket 221 by reference 60 work in operative relation to said wheel, a memto a horizontal edge, such as the lower horizontal face, of the bar 233, or, of course, they may be used to set the bracket 221 by reference the main slide or support to a fixed mark on Ill. a

I may, however, as will be clear from what has earlier above been set forthQas well as from a or otherwise appropriately related .to'the markings .vided in this invention a method and 40 consideration of Figure 3, loosen up the-set screw 2 that fixes the slidablebracket m in position relative.thereto, and, after having raised or lowered the bracket 2 to cause the point 231' tocoincide with the new point or line of contact between regulating wheel and work piece, slide the bracket 2" to the left (Figure 3) along the rod 233 and thereby bring the pointed end 281' of'the pin 231 to restexactly at the periphery ofthe regulating wheel 20 but'to the left of its axis, and then adjust thevertical position of the bracket 2il and hence of the'truing'point or tool iii-so that the latter coincides in vertical position was the point 231.

Where I utilize 'graduations or markings I on the tool bracket 221, as above pointed out, I prefer, however, to provide gracluations on the golding projection 238 similar graduations or markings Illl which may be proportioned, numbered,

800 on'the, truing tool bracket :21; hence, I may, by the markings 30 i read ofi-the change in vertical position that is given the bracket fil -23] and hence the bar 233 and hence the pointer- 281 for any differently diametered'sworkdorwliichthe wheels are to be conditionedor'trued, and the'n by means 'of the graduations or markings vertical position of the bracket-ll landofithe diamond point or truing tool I". 7

It will thus be seen that there has-been proin which the objects of the invention, with many thoroughlypractical advantages, are

' successfulyachieved. Appropriate and" proper conditioning of-the tilted regulating wheel will be seen to be quickly with inpractice, and, moreover, the correct conditioning of the tilted regulating wheel will be seen to be achieved in a simple, speedy and fool proof manner and free from tedious and timeconsumlng operations.

As-many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth, or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense. a

I claim: 1. The combinationwith -a grinding machine having an' abrasive wheel, means for supporting her mounted for movement transversely of the operative surface of said wheelon the side thereof opposite from said work support, and a truing tool carried by' said member and adjustable in position substantially transversely of the direction of movement of said member, of means for gaging the line of contact of said tool and said wheel with respect to the line of contact between said work and said wheel comprising a member extending transverselyof the axis of said wheel and passing adjacent to said truing tool and adjacent to said work support, means mounting said member for adjustment in position in a direction transversely of said two lines, and'a pointer carser e the tool bracket 221, make an identical change-in and easily brought about in spite of the great range of varied conditions met for ooaction with said .latter may beset.

ried by said member adapted to be brought by adjustment ofsaid member into registry with one of said lines or. contact.

2. 'l'he combination with a grinding machine having an abrasive wheel, means for supporting work "in operative relation to said wheel, a

member mounted for movement transversely of the operative surface of said wheel on the side thereof opposite from saidwork support, and a truing. tool carried by said member and adjustable in position substantially transversely of the directlon of movement of said member, of means for gaging theline of contact of said tool and said wheel withrespect to the line of contact between said work and said wheel comprising a member extending transversely of the axis of said wheel andpassing-adjaeent to said truing tool and adjacent to said work support, means mounting said member for adjustment inposition in a direction transversely of said two lines, and a pointer facing inwardly toward said wheel and mounted upon-said member for adjustment in position lengthwise thereof.

3. The combination with a grinding machine having an-abrasive wheel, means for supporting work in operative relation to said wheel, a member mounted for movement transversely of the operativwsurface of said wheel on the side thereof oppflsiteifrom said work support, and a truing tool carried lay-said member and adjustable in position substantially transversely of the direction of movement of said member, of means for gaging the line of contact of said tool and said wheel with ,respectto the line of contact between said work and said wheel comprising a member extending transversely of the axis of said wheel andpassing adjacent to said truing tool and adjacent to said work support, means mounting said member for "adjustment in'position in a direction transversely of said two lines,-a bracket mounted upon said member for adiustmerit in position lengthwise thereof, and a pointer carried in said bracket fac-- ingzw'ward said wheel and slidable in said bracket' towtrd'and away from said-wheel.

ii 'The combination with a grinding machine having means forming a grinding throat comprising a grinding wheel, a work support, and a regulating-wheel whose axis is in tilted relation to the-Raxis ofa workpiece that rests on .said

work support, an elongated device extending across the end face ,of said regulating wheel and extending parallel to the line joining the centers ofsald two-wheels, a member slidable along said elongated device and having a part capable of being positioned at the same vertical displacement from said line as is the point of contact between the work piece and said regulating wheel, a truing tool, and means whereby the truing tool may be set to operate atthat peripheral portion of the regulating wheel juxtaposed from said grinding throat at a position displaced from said line by,the same amount as indicated by said part, said part being slidable along said device truing tool whereby the piece supported in the latter, said truing tool being vertically adjustable, means movably mounted on said machinefor determining the vertical displacement of the line of contact between said work piece and-said regulating wheel 5 relative to a suitable datum, and means operatively connected to said machine and said truing tool responsive to the operation of said movable means for indicating the vertical adjustment to be given said truing tool.

6. The combination with a grinding machine having an abrasive wheel with means for supporting work'in operative relation to said wheel and a truing tool carried by a member mounted for movement across the operative surface of said abrasive wheel on the side thereof opposite from said work-supporting means, of an elongated member supported adjacent said abrasive wheel and extending from the side thereof adjaoent said work-supporting means to the side thereof adjacent said truing tool, a device slidably carried by said elongated member and positionable to either of said sides when slid along said elongated member, said device having a pointer, means for adjustably positioning said pointer in a direction transverse to the direction of sliding movement of-said device along said elongated member, whereby said pointer-may be positioned in the plane of the point of contact between said abrasive wheel and a work piece on said work-supporting means, and means for adjusting the position of said truing tool and hence its path of travel across the said side of said abrasive wheel in accordance with the adjustment given said pointer.

7. The combination with a grinding machine having an abrasive wheel with means for supporting work in operative relation-to said wheel and a truing tool carried by a member mounted for movement across the operative surface of said abrasive wheel on the side thereof opposite from said work-supporting means, of an elongated member supported adjacent said abrasive wheel and extending from the side thereof adjacent said work-supporting means to the side thereof adjacent said truing tool, a device slidably caraosanc ried by said elongated member and positionable to either of said sides when slid along said elongated member, said device having a pointer means for adjustably positioning said pointer in a direction transverse to the direction of sliding movement of said device along said elongated member, whereby said pointer may be positioned in the plane of the point of contact between said abrasive wheel and a work piece on said worksupporting means, said device, after said adjustment, being slidable along said elongated member to said other side of said wheel adjacent said truing tool, thereby positioning said pointer ad jacent the latter, and means for adjusting the position of the truing tool with respect to said pointer.

8. The combination with a grinding machine having an abrasive wheel with a work support in operative relation'thereto, and a truing tool carried by a member mounted for movement across the operative surface of said abrasive wheel on the side thereof opposite said work support, of a bracket, means movably attaching said bracket to a portion of said grinding machine, said bracket including a supporting part extending outwardly from said machine to a point spaced from the front surface of said abrasive wheel, an elongated member secured in said part, an element slidably carried by said elongated member and positionable to either side of said abrasive wheel when slid along said elongated member, said element including a pointer, means for adjustably positioning said pointer in a direction transverse to the direction of sliding movement of said element along said elongated member, whereby said pointer may be positioned in the plane of the point of contact between said abrasive wheel and a work piece on said work support, and means for adjusting the position of said truing tool and hence its path of travel across the said side of said abrasive wheel in accordance with the adjustment given said pointer.

CLEMENT BOOTH. 

